[TowerTalk] Switching 450 ohm twinlead?

[Jim Reid]

At 09:27 PM 6/6/97 -0400, L. B. Cebik wrote:

>Henry,
>
>Unless you are using a matched 450-ohm load to 450-ohm lead, the impedance
>bumps created by relay spacing will be in almost all instances meaningless
>and minor, with no consequences for efficiency/loss of the power transfer.
>
>
>Also, be sure that the relays can handle the high humidity that will
>inevitably be present in the remote box.  Corrosion does not require
>direct contact with rain drops.  

Loyd Colvin,  in his 8/56 QST article,  suggests leaving a small
voltage on the relay coils.  This to provide a bit of heat to
drive the moisutre away.  Wonder if it really works,  I will try
with my set up.  Plan to use a Radio Shack enclosure for the
relays/450 ohm lead/V-beam wire connection.  Guess will use a
metal box rather than the plasic ones.  Must find some feed-thrus
to mount/terminate wires.

73,  Jim, KH7M


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